I'm not aware of anyway to do this, in fact I would think that Apple would not want you to be able to do that for security reasons.

I rarely use Terminal, but could you not just create a text file with the info and keep it handy to copy and paste? Or perhaps use one of the utilities like QuicKeys that allows you to assign hot keys?

If you're logging as root to your webserver - you're asking for trouble. Create an regular user, login and then "su" if you really need to do some stuff!

To answer your question - I personally not aware of the mechanism on Mac to remember ssh login info. It's probably not there for security reasons. Although you can use AppleScript app (and keep it in 128-bit password protected image) to log you automatically to your server. It will open your terminal, log you as regular user and then "su". All automatic! Imagine that! If you need help with AppleScript - PM me. Regards, Mark.

That won't survive sessions, though. To make it permanent, add that command to the file at /users/username/.tcshrc/. If that file doesn't exist, create it. To load it after you created it, type "source .tcshrc". It will load automatically in the future.